A Lost Thimble (http://archiveofourown.org/works/359048) is a charming and well-written AU mixing BBC's Sherlock and Norton's The Borrowers. Since The Borrowers is aimed at children, you might expect unadulterated fluff, but the parts posted so far are wistful and melancholic in tone. Both John and Sherlock seem very much in character. Dialogue is excellent.
Author's Summary: [Borrowers!AU] John Hamish Watson has watched Sherlock Holmes from a close distance since they were children, but they live in differently sized worlds. This does not stop him from losing his heart, or from following it all the way to Baker Street. This is the story of John and Sherlock's adventures in London, and how, through the ruthless cunning of crime consultant Jim Moriarty, they learn that one very tiny borrower can make the biggest difference of all.
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Author's Summary: [Borrowers!AU] John Hamish Watson has watched Sherlock Holmes from a close distance since they were children, but they live in differently sized worlds. This does not stop him from losing his heart, or from following it all the way to Baker Street. This is the story of John and Sherlock's adventures in London, and how, through the ruthless cunning of crime consultant Jim Moriarty, they learn that one very tiny borrower can make the biggest difference of all.